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[CIFS] Fix typo in name of new cifs_show_stats
[linux-2.6-block.git] / fs / cifs / sess.c
CommitLineData
3979877e
SF		 1/*
2 * fs/cifs/sess.c
3 *
4 * SMB/CIFS session setup handling routines
5 *
6 * Copyright (c) International Business Machines Corp., 2006
7 * Author(s): Steve French (sfrench@us.ibm.com)
8 *
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24#include "cifspdu.h"
25#include "cifsglob.h"
26#include "cifsproto.h"
27#include "cifs_unicode.h"
28#include "cifs_debug.h"
29#include "ntlmssp.h"
30#include "nterr.h"
9c53588e 31#include <linux/utsname.h>
3979877e 32
3979877e
SF		 33extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
34 unsigned char *p24);
35
3979877e
SF		 36static __u32 cifs_ssetup_hdr(struct cifsSesInfo *ses, SESSION_SETUP_ANDX *pSMB)
37{
38 __u32 capabilities = 0;
39
40 /* init fields common to all four types of SessSetup */
41 /* note that header is initialized to zero in header_assemble */
42 pSMB->req.AndXCommand = 0xFF;
43 pSMB->req.MaxBufferSize = cpu_to_le16(ses->server->maxBuf);
44 pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
45
46 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
47
48 /* BB verify whether signing required on neg or just on auth frame
49 (and NTLM case) */
50
51 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
52 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
53
54 if(ses->server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
55 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
56
57 if (ses->capabilities & CAP_UNICODE) {
58 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
59 capabilities |= CAP_UNICODE;
60 }
61 if (ses->capabilities & CAP_STATUS32) {
62 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
63 capabilities |= CAP_STATUS32;
64 }
65 if (ses->capabilities & CAP_DFS) {
66 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
67 capabilities |= CAP_DFS;
68 }
69 if (ses->capabilities & CAP_UNIX) {
70 capabilities |= CAP_UNIX;
71 }
72
73 /* BB check whether to init vcnum BB */
74 return capabilities;
75}
76
7c7b25bc 77static void unicode_ssetup_strings(char ** pbcc_area, struct cifsSesInfo *ses,
3979877e
SF		 78 const struct nls_table * nls_cp)
79{
80 char * bcc_ptr = *pbcc_area;
81 int bytes_ret = 0;
82
83 /* BB FIXME add check that strings total less
84 than 335 or will need to send them as arrays */
85
0223cf0b
SF		 86 /* unicode strings, must be word aligned before the call */
87/* if ((long) bcc_ptr % 2) {
3979877e
SF		 88 *bcc_ptr = 0;
89 bcc_ptr++;
0223cf0b 90 } */
3979877e
SF		 91 /* copy user */
92 if(ses->userName == NULL) {
93 /* BB what about null user mounts - check that we do this BB */
94 } else { /* 300 should be long enough for any conceivable user name */
95 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->userName,
96 300, nls_cp);
97 }
98 bcc_ptr += 2 * bytes_ret;
99 bcc_ptr += 2; /* account for null termination */
100 /* copy domain */
101 if(ses->domainName == NULL)
102 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr,
103 "CIFS_LINUX_DOM", 32, nls_cp);
104 else
105 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->domainName,
106 256, nls_cp);
107 bcc_ptr += 2 * bytes_ret;
108 bcc_ptr += 2; /* account for null terminator */
109
110 /* Copy OS version */
111 bytes_ret = cifs_strtoUCS((__le16 *)bcc_ptr, "Linux version ", 32,
112 nls_cp);
113 bcc_ptr += 2 * bytes_ret;
114 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, system_utsname.release,
115 32, nls_cp);
116 bcc_ptr += 2 * bytes_ret;
117 bcc_ptr += 2; /* trailing null */
118
119 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
120 32, nls_cp);
121 bcc_ptr += 2 * bytes_ret;
122 bcc_ptr += 2; /* trailing null */
123
124 *pbcc_area = bcc_ptr;
125}
126
7c7b25bc 127static void ascii_ssetup_strings(char ** pbcc_area, struct cifsSesInfo *ses,
3979877e
SF		 128 const struct nls_table * nls_cp)
129{
130 char * bcc_ptr = *pbcc_area;
131
132 /* copy user */
133 /* BB what about null user mounts - check that we do this BB */
134 /* copy user */
135 if(ses->userName == NULL) {
136 /* BB what about null user mounts - check that we do this BB */
137 } else { /* 300 should be long enough for any conceivable user name */
138 strncpy(bcc_ptr, ses->userName, 300);
139 }
140 /* BB improve check for overflow */
750d1151 141 bcc_ptr += strnlen(ses->userName, 300);
3979877e
SF		 142 *bcc_ptr = 0;
143 bcc_ptr++; /* account for null termination */
144
145 /* copy domain */
146
147 if(ses->domainName == NULL) {
148 strcpy(bcc_ptr, "CIFS_LINUX_DOM");
149 bcc_ptr += 14; /* strlen(CIFS_LINUX_DOM) */
150 } else {
151 strncpy(bcc_ptr, ses->domainName, 256);
152 bcc_ptr += strnlen(ses->domainName, 256);
153 }
154 *bcc_ptr = 0;
155 bcc_ptr++;
156
157 /* BB check for overflow here */
158
159 strcpy(bcc_ptr, "Linux version ");
160 bcc_ptr += strlen("Linux version ");
161 strcpy(bcc_ptr, system_utsname.release);
162 bcc_ptr += strlen(system_utsname.release) + 1;
163
164 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
165 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
166
167 *pbcc_area = bcc_ptr;
168}
169
7c7b25bc 170static int decode_unicode_ssetup(char ** pbcc_area, int bleft, struct cifsSesInfo *ses,
3979877e
SF		 171 const struct nls_table * nls_cp)
172{
173 int rc = 0;
174 int words_left, len;
175 char * data = *pbcc_area;
176
177
178
179 cFYI(1,("bleft %d",bleft));
180
181
182 /* word align, if bytes remaining is not even */
183 if(bleft % 2) {
184 bleft--;
185 data++;
186 }
187 words_left = bleft / 2;
188
189 /* save off server operating system */
190 len = UniStrnlen((wchar_t *) data, words_left);
191
192/* We look for obvious messed up bcc or strings in response so we do not go off
193 the end since (at least) WIN2K and Windows XP have a major bug in not null
194 terminating last Unicode string in response */
195 if(len >= words_left)
196 return rc;
197
198 if(ses->serverOS)
199 kfree(ses->serverOS);
200 /* UTF-8 string will not grow more than four times as big as UCS-16 */
201 ses->serverOS = kzalloc(4 * len, GFP_KERNEL);
202 if(ses->serverOS != NULL) {
203 cifs_strfromUCS_le(ses->serverOS, (__le16 *)data, len,
204 nls_cp);
205 }
206 data += 2 * (len + 1);
207 words_left -= len + 1;
208
209 /* save off server network operating system */
210 len = UniStrnlen((wchar_t *) data, words_left);
211
212 if(len >= words_left)
213 return rc;
214
215 if(ses->serverNOS)
216 kfree(ses->serverNOS);
217 ses->serverNOS = kzalloc(4 * len, GFP_KERNEL); /* BB this is wrong length FIXME BB */
218 if(ses->serverNOS != NULL) {
219 cifs_strfromUCS_le(ses->serverNOS, (__le16 *)data, len,
220 nls_cp);
221 if(strncmp(ses->serverNOS, "NT LAN Manager 4",16) == 0) {
222 cFYI(1,("NT4 server"));
223 ses->flags |= CIFS_SES_NT4;
224 }
225 }
226 data += 2 * (len + 1);
227 words_left -= len + 1;
228
229 /* save off server domain */
230 len = UniStrnlen((wchar_t *) data, words_left);
231
232 if(len > words_left)
233 return rc;
234
235 if(ses->serverDomain)
236 kfree(ses->serverDomain);
237 ses->serverDomain = kzalloc(2 * (len + 1), GFP_KERNEL); /* BB FIXME wrong length */
238 if(ses->serverDomain != NULL) {
239 cifs_strfromUCS_le(ses->serverDomain, (__le16 *)data, len,
240 nls_cp);
241 ses->serverDomain[2*len] = 0;
242 ses->serverDomain[(2*len) + 1] = 0;
243 }
244 data += 2 * (len + 1);
245 words_left -= len + 1;
246
247 cFYI(1,("words left: %d",words_left));
248
249 return rc;
250}
251
7c7b25bc 252static int decode_ascii_ssetup(char ** pbcc_area, int bleft, struct cifsSesInfo *ses,
3979877e
SF		 253 const struct nls_table * nls_cp)
254{
255 int rc = 0;
256 int len;
257 char * bcc_ptr = *pbcc_area;
258
259 cFYI(1,("decode sessetup ascii. bleft %d", bleft));
260
261 len = strnlen(bcc_ptr, bleft);
262 if(len >= bleft)
263 return rc;
264
265 if(ses->serverOS)
266 kfree(ses->serverOS);
267
268 ses->serverOS = kzalloc(len + 1, GFP_KERNEL);
269 if(ses->serverOS)
270 strncpy(ses->serverOS, bcc_ptr, len);
271
272 bcc_ptr += len + 1;
273 bleft -= len + 1;
274
275 len = strnlen(bcc_ptr, bleft);
276 if(len >= bleft)
277 return rc;
278
279 if(ses->serverNOS)
280 kfree(ses->serverNOS);
281
282 ses->serverNOS = kzalloc(len + 1, GFP_KERNEL);
283 if(ses->serverNOS)
284 strncpy(ses->serverNOS, bcc_ptr, len);
285
286 bcc_ptr += len + 1;
287 bleft -= len + 1;
288
289 len = strnlen(bcc_ptr, bleft);
290 if(len > bleft)
291 return rc;
292
293 if(ses->serverDomain)
294 kfree(ses->serverDomain);
295
296 ses->serverDomain = kzalloc(len + 1, GFP_KERNEL);
297 if(ses->serverOS)
298 strncpy(ses->serverOS, bcc_ptr, len);
299
300 bcc_ptr += len + 1;
301 bleft -= len + 1;
302
303 cFYI(1,("ascii: bytes left %d",bleft));
304
305 return rc;
306}
307
308int
309CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
310 const struct nls_table *nls_cp)
311{
312 int rc = 0;
313 int wct;
3979877e
SF		 314 struct smb_hdr *smb_buf;
315 char *bcc_ptr;
750d1151 316 char *str_area;
3979877e
SF		 317 SESSION_SETUP_ANDX *pSMB;
318 __u32 capabilities;
319 int count;
320 int resp_buf_type = 0;
750d1151 321 struct kvec iov[2];
3979877e
SF		 322 enum securityEnum type;
323 __u16 action;
324 int bytes_remaining;
254e55ed 325
3979877e
SF		 326 if(ses == NULL)
327 return -EINVAL;
328
329 type = ses->server->secType;
f40c5628
SF		 330
331 cFYI(1,("sess setup type %d",type));
3979877e
SF		 332 if(type == LANMAN) {
333#ifndef CONFIG_CIFS_WEAK_PW_HASH
334 /* LANMAN and plaintext are less secure and off by default.
335 So we make this explicitly be turned on in kconfig (in the
336 build) and turned on at runtime (changed from the default)
337 in proc/fs/cifs or via mount parm. Unfortunately this is
338 needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
339 return -EOPNOTSUPP;
340#endif
341 wct = 10; /* lanman 2 style sessionsetup */
9312f675
SF		 342 } else if((type == NTLM) || (type == NTLMv2)) {
343 /* For NTLMv2 failures eventually may need to retry NTLM */
3979877e 344 wct = 13; /* old style NTLM sessionsetup */
9312f675 345 } else /* same size for negotiate or auth, NTLMSSP or extended security */
3979877e
SF		 346 wct = 12;
347
348 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
349 (void **)&smb_buf);
350 if(rc)
351 return rc;
352
353 pSMB = (SESSION_SETUP_ANDX *)smb_buf;
354
355 capabilities = cifs_ssetup_hdr(ses, pSMB);
750d1151
SF		 356
357 /* we will send the SMB in two pieces,
358 a fixed length beginning part, and a
359 second part which will include the strings
360 and rest of bcc area, in order to avoid having
361 to do a large buffer 17K allocation */
362 iov[0].iov_base = (char *)pSMB;
363 iov[0].iov_len = smb_buf->smb_buf_length + 4;
364
365 /* 2000 big enough to fit max user, domain, NOS name etc. */
366 str_area = kmalloc(2000, GFP_KERNEL);
367 bcc_ptr = str_area;
3979877e
SF		 368
369 if(type == LANMAN) {
370#ifdef CONFIG_CIFS_WEAK_PW_HASH
7c7b25bc 371 char lnm_session_key[CIFS_SESS_KEY_SIZE];
3979877e
SF		 372
373 /* no capabilities flags in old lanman negotiation */
374
5ddaa683 375 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
3979877e
SF		 376 /* BB calculate hash with password */
377 /* and copy into bcc */
378
7c7b25bc 379 calc_lanman_hash(ses, lnm_session_key);
3979877e 380
750d1151 381/* #ifdef CONFIG_CIFS_DEBUG2
3979877e 382 cifs_dump_mem("cryptkey: ",ses->server->cryptKey,
7c7b25bc 383 CIFS_SESS_KEY_SIZE);
750d1151 384#endif */
7c7b25bc
SF		 385 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_SESS_KEY_SIZE);
386 bcc_ptr += CIFS_SESS_KEY_SIZE;
3979877e
SF		 387
388 /* can not sign if LANMAN negotiated so no need
389 to calculate signing key? but what if server
390 changed to do higher than lanman dialect and
391 we reconnected would we ever calc signing_key? */
392
750d1151 393 cFYI(1,("Negotiating LANMAN setting up strings"));
3979877e
SF		 394 /* Unicode not allowed for LANMAN dialects */
395 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
396#endif
397 } else if (type == NTLM) {
7c7b25bc 398 char ntlm_session_key[CIFS_SESS_KEY_SIZE];
3979877e
SF		 399
400 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
401 pSMB->req_no_secext.CaseInsensitivePasswordLength =
7c7b25bc 402 cpu_to_le16(CIFS_SESS_KEY_SIZE);
3979877e 403 pSMB->req_no_secext.CaseSensitivePasswordLength =
7c7b25bc 404 cpu_to_le16(CIFS_SESS_KEY_SIZE);
3979877e
SF		 405
406 /* calculate session key */
407 SMBNTencrypt(ses->password, ses->server->cryptKey,
408 ntlm_session_key);
409
410 if(first_time) /* should this be moved into common code
411 with similar ntlmv2 path? */
750d1151 412 cifs_calculate_mac_key(ses->server->mac_signing_key,
3979877e
SF		 413 ntlm_session_key, ses->password);
414 /* copy session key */
415
7c7b25bc
SF		 416 memcpy(bcc_ptr, (char *)ntlm_session_key,CIFS_SESS_KEY_SIZE);
417 bcc_ptr += CIFS_SESS_KEY_SIZE;
418 memcpy(bcc_ptr, (char *)ntlm_session_key,CIFS_SESS_KEY_SIZE);
419 bcc_ptr += CIFS_SESS_KEY_SIZE;
0223cf0b
SF		 420 if(ses->capabilities & CAP_UNICODE) {
421 /* unicode strings must be word aligned */
422 if (iov[0].iov_len % 2) {
423 *bcc_ptr = 0;
424 bcc_ptr++;
425 }
7c7b25bc 426 unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
0223cf0b 427 } else
7c7b25bc
SF		 428 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
429 } else if (type == NTLMv2) {
6d027cfd
SF		 430 char * v2_sess_key =
431 kmalloc(sizeof(struct ntlmv2_resp), GFP_KERNEL);
f64b23ae
SF		 432
433 /* BB FIXME change all users of v2_sess_key to
434 struct ntlmv2_resp */
7c7b25bc
SF		 435
436 if(v2_sess_key == NULL) {
437 cifs_small_buf_release(smb_buf);
438 return -ENOMEM;
439 }
440
441 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
442
443 /* LM2 password would be here if we supported it */
444 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
445 /* cpu_to_le16(LM2_SESS_KEY_SIZE); */
446
447 pSMB->req_no_secext.CaseSensitivePasswordLength =
f64b23ae 448 cpu_to_le16(sizeof(struct ntlmv2_resp));
7c7b25bc
SF		 449
450 /* calculate session key */
1717ffc5 451 setup_ntlmv2_rsp(ses, v2_sess_key, nls_cp);
7c7b25bc
SF		 452 if(first_time) /* should this be moved into common code
453 with similar ntlmv2 path? */
454 /* cifs_calculate_ntlmv2_mac_key(ses->server->mac_signing_key,
455 response BB FIXME, v2_sess_key); */
456
457 /* copy session key */
458
459 /* memcpy(bcc_ptr, (char *)ntlm_session_key,LM2_SESS_KEY_SIZE);
460 bcc_ptr += LM2_SESS_KEY_SIZE; */
f64b23ae
SF		 461 memcpy(bcc_ptr, (char *)v2_sess_key, sizeof(struct ntlmv2_resp));
462 bcc_ptr += sizeof(struct ntlmv2_resp);
463 kfree(v2_sess_key);
0223cf0b
SF		 464 if(ses->capabilities & CAP_UNICODE) {
465 if(iov[0].iov_len % 2) {
466 *bcc_ptr = 0;
467 } bcc_ptr++;
3979877e 468 unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
0223cf0b 469 } else
3979877e
SF		 470 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
471 } else /* NTLMSSP or SPNEGO */ {
472 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
473 capabilities |= CAP_EXTENDED_SECURITY;
474 pSMB->req.Capabilities = cpu_to_le32(capabilities);
475 /* BB set password lengths */
476 }
477
750d1151 478 count = (long) bcc_ptr - (long) str_area;
3979877e
SF		 479 smb_buf->smb_buf_length += count;
480
3979877e
SF		 481 BCC_LE(smb_buf) = cpu_to_le16(count);
482
750d1151
SF		 483 iov[1].iov_base = str_area;
484 iov[1].iov_len = count;
485 rc = SendReceive2(xid, ses, iov, 2 /* num_iovecs */, &resp_buf_type, 0);
3979877e
SF		 486 /* SMB request buf freed in SendReceive2 */
487
488 cFYI(1,("ssetup rc from sendrecv2 is %d",rc));
489 if(rc)
490 goto ssetup_exit;
491
492 pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base;
493 smb_buf = (struct smb_hdr *)iov[0].iov_base;
494
495 if((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) {
496 rc = -EIO;
497 cERROR(1,("bad word count %d", smb_buf->WordCount));
498 goto ssetup_exit;
499 }
500 action = le16_to_cpu(pSMB->resp.Action);
501 if (action & GUEST_LOGIN)
189acaae 502 cFYI(1, ("Guest login")); /* BB mark SesInfo struct? */
3979877e
SF		 503 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
504 cFYI(1, ("UID = %d ", ses->Suid));
505 /* response can have either 3 or 4 word count - Samba sends 3 */
506 /* and lanman response is 3 */
507 bytes_remaining = BCC(smb_buf);
508 bcc_ptr = pByteArea(smb_buf);
509
510 if(smb_buf->WordCount == 4) {
511 __u16 blob_len;
512 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
513 bcc_ptr += blob_len;
514 if(blob_len > bytes_remaining) {
515 cERROR(1,("bad security blob length %d", blob_len));
516 rc = -EINVAL;
517 goto ssetup_exit;
518 }
519 bytes_remaining -= blob_len;
520 }
521
522 /* BB check if Unicode and decode strings */
523 if(smb_buf->Flags2 & SMBFLG2_UNICODE)
524 rc = decode_unicode_ssetup(&bcc_ptr, bytes_remaining,
525 ses, nls_cp);
526 else
527 rc = decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,nls_cp);
528
529ssetup_exit:
750d1151 530 kfree(str_area);
3979877e
SF		 531 if(resp_buf_type == CIFS_SMALL_BUFFER) {
532 cFYI(1,("ssetup freeing small buf %p", iov[0].iov_base));
533 cifs_small_buf_release(iov[0].iov_base);
534 } else if(resp_buf_type == CIFS_LARGE_BUFFER)
535 cifs_buf_release(iov[0].iov_base);
536
537 return rc;
538}
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